3  SST anoms, 5-year means and trends 2024

cciea_yr = 2024

Description     Seasonal SST summary maps are derived from the three statistics shown in the IEA type time series (current value, mean and trend over the last 5 years).

Indicator Category     Climate and Ocean Drivers

Data Steward     Schroeder

Erddap Dataset ID     Not in the metadata database

CCIEA timeseries ID     Not in the metadata database

Region     165 - 115W, 30-60N

Additional Information     The seasonal averages are: winter (Jan-Mar), spring (Apr-Jun), summer (Jul-Sep), and summer (Oct-Nov). Daily SST maps are optimally interpolated, remotely sensed temperatures (Huang et al. 2021). The daily optimal interpolated AVHRR SST can be downloaded from ERDDAP, https://coastwatch.pfeg.noaa.gov/erddap/index.html, dataset ID: ncdcOisst21Agg.

Figures

(a) Winter

(b) Spring

(c) Summer

(d) Fall

Figure 3.1: Sea surface temperature (SST) anomalies (2024; left), five-year means (2019–2024; middle), and five-year trends (2019–2024; right) in winter (a, Jan-Mar), spring (b, Apr-Jun), summer (c, Jul–Sep), and fall (d, Oct-Dec). The time series at each grid point began in 1982. Black circles mark cells where the anomaly was >1 SD above the long-term mean. Black x’s mark cells where the anomaly was the highest (or lowest) of the time series.

Diagnositc maps with time series at key locations

(a) Winter 2024 Anom

(b) Winter 2020 - 2024 Mean

(c) Winter 2020 - 2024 Trend

(d) Spring 2024 Anom

(e) Spring 2020 - 2024 Mean

(f) Spring 2020 - 2024 Trend

(g) Summer 2024 Anom

(h) Summer 2020 - 2024 Mean

(i) Summer 2020 - 2024 Trend

(j) Fall 2024 Anom

(k) Fall 2020 - 2024 Mean

(l) Fall 2020 - 2024 Trend

Figure 3.2: Understanding the anoms, 5-year means and trends can be difficult without looking at time series. These are diagnostic plots that have IEA time series at key locations on the maps.

2024 Conditions

• Winter SST anomalies were positive (above 1°C) along the coast, the usual pattern for an El Niño winter Figure 8.2 (a).
• Summer SST anomalies were negative in the north and south (~1°C) and slightly above average (~0.5°C) in central California Figure 8.2 (c).
• Summer SST anomalies offshore were positve near the highest of the time series for the area centered on 45°N - 140°W Figure 8.2 (c).

References

Huang, Boyin, Chunying Liu, Viva Banzon, Eric Freeman, Garrett Graham, Bill Hankins, Tom Smith, and Huai-Min Zhang. 2021. “Improvements of the Daily Optimum Interpolation Sea Surface Temperature (DOISST) Version 2.1.” Journal of Climate 34 (8): 2923–39. https://doi.org/10.1175/jcli-d-20-0166.1.